Knife-guard and grinding device for meat-slicers.



J. HOPKINSON L F.v THOMAS.

KNIFE GUARD AND GRINDING DEVICE FOR MEATASLICERS. APPLICATION FILED 1uNE'30. 1916.

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APPLICATION FILED JUNE 30,19l6

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Specification of Letters Patent.

Patented Apr.. 23, luid..

Application led .Tune 3i), 1916. Serial No. 106,780.

To all whom t may concern:` ,y

Be it known'that we, JOSEPH IIorKrNsoN and FELIX THoMAs, both citizens of the United States, and residing at, respectively, Dayton, in the county of. Montgomery and State of Ohio, and at New York, in the county and State of New York, have invented certain new and useful Improvements in Knife-Guards andGrinding Devices for Meat-Slicers, of which the following is a full, clear, and exact description.

This invention relates to improvements in meat slicers and is particularly7 directed to improvements in` the construction of the knife guards and in the grinding devices for the cutting knife.

In the prior copending application of Joseph Hopkinson and C. I'I. Maltby, Ser.

i No. 43,913, a' construction was employed in which the circular knife was guarded by a fixed circular guard having pocket portions which contained and supported the grinding devices. This construction is entirely satisfactory in commercial machines except that the inside of the guard and the grinding pockets tended to collect lard, grease and bits of meat. To keep the machine in a clean and sanitary condition it is frequently necessary to clean the parts and remove the collected grease and fragments of meat.4 Y

The construction now to be described is such that the machine can be easily kept in a sanitary condition by the most inexperienced persons. All parts which might collect grease are either made removable for cleaning or they are adapted to be displaced from their normal operating position to such a position that cleaning can be performed expeditiously. The construction however is simple and not likely to get out of order even when handled by persons unfamiliar with machinery.

In the drawing:

Figure 1 shows a perspective view of the machine with the circular guard in guarding position and the grinder box swung down in a position for cleaning.

Fig. 2 shows a rear elevation of the machine, and shows the grinder box and the circular and plate guard in the positions which they occupy when the machine is in use. ,Y p l Y Fig. 3 shows a front elevation 0f a portion of the circular knife, grinder box and circular guard in Jtheir normal operating position.

Fig. l is a detail end view of the grinder' box.

Fig. 5 is a sectional view of the grinder box taken on line 5--5 of Fig.

Fig. 6 is a sectional view of the grinder box taken on line (5*6 of F ig. 7 is a detail view of the circular guard detached from its supporting brackets.

Fig. 8 is a plan view of the plate guard showing its cooperation with the support and its pivot.

In more detail the slicing machine is of the form shown in the previously mentioned Hopkinson and Maltby application and comprises a base 10, meat plate 11, meat clamp 12, and circular concavo-convex knife 13. As is customary in slicing machines the meat is advanced against the knife by the reciprocation of the meat plate and is held in position thereon b v the meat clamp 12.

Extending upward from the .base is a pedestal 111 which supports the arbor carrying the knife 13. A meat tray l5 is secured in position adjacent the knife and is readily removable for cleaning by removing set screws 16. Directly below the knife is a drawer 17 which rests upon the base 10 in a position to receive anyscraps of meat or grease which may be thrown vertically downward from the knife. The drawer has a handle 18 by which it may be withdrawn from its position below the knife.

Supported by pedestal 1liV and extending outwardly toward the periphery 0f the knife is a bracket 19 which carries at its ends the bosses 20 to which the circular knife guard 21 is secured by means of the knurled screws 22. The circular guard has a round channel section and extends down below the cutting periphery 23 of the knife and effectually guards the upper portion thereof. The circular guard 21 carries bosses 24 which co-` operate with the previously mentioned bosses 20, and which carry the set screws 22. The front forward end of bracket 19 itself forms a guardfor a short portion of the periphery of the knife. This portion of the bracket does not extend completely over` the knifelike guard 21, but is broken away at 25 to provide clearance for the meat clamp 12 in it-s reciprocation. Yet

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its pivot 28 and cleaned.

the edge 25 of the bracket extends slightly inside the cutting periphery as shown in Fig. l8, so that the knife is guarded at this point and injuries to operators are prevented. A plate guard 27 is pivoted to the base at 28 and has integral therewith a nose which extends inwardly and is engaged by va spring pressed catch 29 carried by the bracket 19. The plate guard is of the form shown in the previously mentioned application and requires no further description. By withdrawing vthe spring plunger 29 the plate guard may be swung sidewise about By removing knurled screws 22 the circular guard 21 can be detached and cleaned.

Sanitary grinder box construction.

Vin Figs. 2 and 3 and that shown in Fig. 1. lIn the first position the box is in the normal operating position in which the grinders are ready to grind the knife. The box is held in this (normal position) by a knurled set screw 35 which is carried by bracket 30 and rwhich screws into a threaded hole in boss 36 in the grinderbox (see Fig. 1). When the grinder boxis in normal position the open side thereof is closed by a cover plate 37 siiitablyheld in position by set screws (see Fig. 4.). One side of the grinder box is slotted at 38 to allow the knife 13 to project into the box. When it is desired to clean the inside of the grinder box and the grinders therein, the set screw 35 is released, the coverv plate 37 removed and the entire box is swung down about pivot 32 to the position shown in Fig. 1. When the box is in this position it can be easily washed and cleaned and can be thus kept in a sanitary condition at all times by the most inexperienced person. It will also be understood that by removing the pintle 32 both the grinder box and the grinders may be removed forcleaning or repairing.

Grinder mounting.

. The grinder devices are mounted in the grinder box in similar manner to the mounting of the grinders in the Hopkinson and Maltby application. There are two abrasive wheels 60 and 61. Wheel 60 sharpens projects from the grinder box 34. The spindle 62 is angularly mounted in the grinder box with respect to the axis of the knife 13 as shown in Figs. 6 and 1. When the grinder box is in normal position (see Figs. 2 and 3) the wheel 60 can be advanced to, or retracted from contact with the con- 4vex side of the knife 13 by turning the knurled knob 66 which is rigidly secured to the end of the spindle 62. When in contact, upon rotating the knife the wheel G0 will rotate and the knife will be sharpened to an angle edge as shown in Fig. 6.

The abrasive wheel 61 is similarly mounted upon a spindle 67, which spindle is screw threaded and engaged by threads in a boss 69 projectingfroni the grinder box. When the grinder box is in normal position (as shown in Figs. 2 and 3), the axis of spindle 67 .extends in a direction parallel with the axis of the knife 13. The spindle 67 carries on its end a knurled knob 70 and by turning this knob the wheel 61 can be advanced to grind the bur from the concave side of the knife as shown in Fig. 5.

In order to prevent the grinders 60 and 61 from accidentally coming into contact with the knife 13, we provide set screws 72 and '73 in the bosses, which set screws are adapted to contact against the grinder spindles and lock them in any desired position.

1t will be understood that our invention is not limited to the precise form shown and described. What we claim as our invention is more particularly pointed out in the ap- -pended claims.

7e claim 1. In a meat slicing machine, in combina- `tion, with the base, a one piece grinder box fhaving aplurality of grinders supported therein and by the walls of said box, said grinder box being adapted to be retained in i one position for normal operations such as grinding the knife, and to be released and to 'be bodily displaced from normal position f adjacent the knife for cleaning, substantially as described.

projecting therefrom, a grinder box mounted upon the base independently of the aforesaid bracket, said grinder box having provisions whereby it may be swung from its normal operating position to a second position in operative association with the bracket in which it is more accessible for cleaning.

3. In a meat slicing machine, in coinbination, with a circulairotating knife, a one piece grinder box to inclose grinders disposed adjacent the periphery of the knife, a pivotal support for the box, said pivotal support permitting said grinding box to be displaced substantially radially from the periphery of the knife to permit the interior of the box to be cleaned.

4. In a meat slicing machine, in combination, with a circular rotating knife, a grinder box disposed adjacent the periphery of the knife and having a pair of grinder wheels therein, said grinder' Wheels being revolubly mounted upon spindles which are threaded in the walls of the box and a pivotal support for the grinder box, to permit the box and the grinder therein to be displaced away from the knife, to permit the cleaning of the interior of the box and of the said grinders.

5. In a meat slicing machine, in combination, with circular rotating knife, a grinder box disposed adjacent the periphery of the knife and having a pair of grinder wheels therein, said grinder wheels being revolubly mounted upon spindles which are threaded in the walls of the grinder box, set screws to lock the spindles and prevent the advance of the grinder wheels in the said box and a pivotal support for theI grinder box to permit the said box and the grinders therein to be displaced from the periphery of the knife to ,an accessible position for cleaning.

(i. In a meat slicing' machine, in combinan tion, with a circular rotating knife, a grinder box having provisions for supporting a sharpening and a bur removing grinder therein and thereby, a pivotal support for said grinder box on a rigid portion of the machine, and a means for engaging the said box and for thereby maintaining the grinders therein in cooperative relation with the periphery of the cutting knife, said pivotal mounting for the grinder box permitting said box to be displaced for cleaning substantially as described.

7. In a meat slicing machine, in combina tion, with a circular rotating knife, a grinder box having provisions for supporting a e-:harpening and a bur removing grinder therein, a pivotal support for the said box, a means independent of the pivotal support for securing the said box in such a position that the grinders therein are in cooperative relation with the circular knife and a cover for the said box, said cover being entirely removable from the box to permit the cleaning of the inside of the grinder box.

8. In a meat slicing machine, in combination, a grinder box having an open side through which the circular knife may project into the box, a removable closure therefor, a pivoted support for the said box and a retaining means independent of the pivoted support for holding the box in normal position with the grinders therein, in coperative relation with the cutting knife.

9. In a meat slicing machine, in co1nbination, with a circular' concave convex knife, a grinder box pivotally mounted upon thebase of the machine to swing directly awayfrom said knife in a direction substantially radial thereto, a plurality of grinders in said box, each of said grinders being adjustably supported by the walls of the said box, one grinder being adapted to grind the convex side of the knife, and the second of said grinders being adapted to remove the bur from the concave side of the knife. v

lO. In a meat slicing machine, in combination, with a circular rotating knife, a grinder box'having provisions for supporting a pair of grinding devices therein, a pair of threaded spindles supported by the said box, revoluble grinders on the said spindles, said spindles having their axes extending at angles to one another, whereby one grinder is adapted to angularly grind one side of the knife and the other is adapted to remove the bur from the concave side of the knife, and a pivotal support for the grinder box to permit its displacement for cleaning.

1l. In a meat slicing machine, in combination, a base; a circular knife; -a plurality of brackets supported thereby and independent of each other; a grinder box pivotally mounted upon one of said brackets and having a vnianipuiative means for attaching the same to the other bracket; an d grinder means supported in and by the said box to grind the knife and remove the bur therefrom, the pivotal support for the said box permitting the box to be bodily displaced away from the periphery of the knife for cleaning, substantially as described.

In testimony whereof we affix our signatures.

JOSEPH HOPKINSON. FELIX THOMAS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, ID. C. 

